Just in case an exiled LJ user comes this way and thinks "... hey, this looks an awful lot like a Flexible Squares layout! How can this be?"

Go here - and you'll find out how it can be :D

And in case you start to wonder where to host that external stylesheet now - don't bother. Create a theme layer for your newly created layout layer and add this:

function print_stylesheet()
{
"""
Enter your stylesheet here

""";
}

I just need a second post to see how things look in this layout